Michael Whitaker suspended in horse doping case
The International Equestrian Federation (FEI) has confirmed British rider Michael Whitaker has been provisionally suspended after his mount Thackeray tested positive in a competition last May at La Baule, France.
The FEI said Thackeray would remain grounded until the B sample has been analysed.
Michael Whitaker believes the synthetic hormone altrenogest was administered to the horse with its feed. The substance is found in Regu-Mate and is used as an anti-irritant in hot conditions.
Younger brother of British showjumping champion John Whitaker, Michael could now miss the European Championships which take place at Windsor at the end of August.
Regu-Mate promotional material lists its benefits and uses as ...
Regu-Mate the proven performer for performance mares - When you’re campaigning a mare, every advantage counts. That’s why more and more trainers are turning to Regu-Mate to suppress estrus and make their mares’ performances more predictable.
- Regu-Mate effectively suppresses estrus in 95 percent of mares after 3 days of treatment.
- When treatment is discontinued, mares exhibiting regular estrous cycles return to estrus within 4 to 5 days following treatment and continue to cycle normally.
- Regu-Mate can help alleviate moodiness and temperament changes associated with estrus.
- It’s easy to administer – orally or top-dressed on grain.

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